A numeric column's number_format (columns_config value), exactly as
the Style tab's editor WRITES it — the ts-rs projection of the Rust
CustomNumberFormatConfig, re-composed with its serde-flattened
style and notation families (ts-rs cannot flatten Option<enum>,
so the Rust type #[ts(skip)]s them and they export separately).
A numeric column's
number_format(columns_configvalue), exactly as the Style tab's editor WRITES it — the ts-rs projection of the RustCustomNumberFormatConfig, re-composed with its serde-flattenedstyleandnotationfamilies (ts-rs cannot flattenOption<enum>, so the Rust type#[ts(skip)]s them and they export separately).